The space inside toroid is filled with a material whose susceptibility is \( 2 \times 10^{-2} \)...

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The space inside toroid is filled with a material whose susceptibility is \( 2 \times 10^{-2} \). Then the percentage change in magnetic field is
(a) 0
(b) 2
(c) \( 2 \times 10^{-2} \)
(d) \( 1 \times 10^{-2} \)
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